From their site: The Google Gadgets API provides a way to put third-party content onto the Google homepage. The main use of the Google Gadgets API is to create gadgets (mini-applications) that users...

The Spore API gives you access to the database for the game Spore from Maxis and Electronic Arts. Millions of custom content created and shared by the community of players. You can select items made...

Guild Wars 2 is a popular MMORPG. The game has an API allowing developers to access game data for use in third party applications. API endpoints include dynamic events, guilds, items, map information...

Redbox provides automated movie and video game rental kiosks throughout the US. They have more than 35,000 locations, and individual kiosks may provide as many as 200 titles and 630 discs. The Redbox...

Magic: The Gathering is a card trading game in which players use a set of printed or virtual cards. As of 2011, the official database listed over 11,000 distinct card types.
The Magic: the Gathering...

TwitchTV is a video game broadcasting and chat community featuring gaming personalities, players, tournaments, leagues, and commentary. The TwitchTV API, composed of a REST API and a Javascript SDK,...